XADM: Deadlock in STORE Due to a Stack Overflow

ID: Q195971

The information in this article applies to:

Microsoft Exchange Server, versions 5.5, 5.0

SYMPTOMS

The Microsoft Exchange information store may stop responding (hang) because of a stack overflow when processing a corrupted message. After this happens, the client cannot log on to the Exchange Server computer and cannot send or receive a message.

CAUSE

This happens because the message contains a corrupted attachment, in this case, there is no "END" section for the encoded attachment. When the information store encounters an incomplete sequence at the end of the encoded line, it keeps appending more data, but makes no progress with decoding.

RESOLUTION

Exchange Server 5.5

To resolve this problem, obtain the latest service pack for Exchange Server version 5.5. For more information, please see the following article in the Microsoft Knowledge Base:

Q191014 XGEN: How to Obtain the Latest Exchange Server 5.5 Service Pack

The English version of this fix should have the following file attributes or later:

Component: Information Store

File Name	Version
Gapi32.dll	5.5.2446.0
Mdbmsg.dll	5.5.2446.0
Store.exe	5.5.2446.0

Exchange Server 5.0

A supported fix that corrects this problem is now available from Microsoft, but it has not been fully regression tested and should be applied only to systems experiencing this specific problem. If you are not severely affected by this specific problem, Microsoft recommends that you wait for the next version of Exchange Server 5.0 that contains this fix.

To resolve this problem immediately, contact Microsoft Product Support Services to obtain the fix. For a complete list of Microsoft Product Support Services phone numbers and information on support costs, please go to the following address on the World Wide Web:

http://www.microsoft.com/support/supportnet/overview/overview.asp

The English version of this fix should have the following file attributes or later:

Component: Information Store

File Name	Version
Mdbmsg.dll	5.0.1461.91
Store.exe	5.0.1461.91

STATUS

Microsoft has confirmed this to be a problem in Microsoft Exchange Server versions 5.0 and 5.5.

STATUS

Additional query words: QFE UUENCODE

Keywords : exc55sp2fix exc5 exc55
Version : winnt:5.0,5.5
Platform : winnt
Issue type : kbbug